Quick Introduction

JUGENE Usage Model

The IBM Blue Gene/P uses so called front-end nodes or login nodes running Linux for interactive access and the submission of batch jobs. Parallel applications have to be cross-compiled on the front-end nodes and can only be executed on the partition residing on the BG/P compute nodes. Access is automatically controlled by the LoadLeveler batch system, which chooses the appropriate partition depending on the requested resources. Serial jobs are executed on the front-end node.

Batch System on JUGENE

The batch system on JUGENE is LoadLeveler. The batch system is responsible for managing jobs on the machine, returning job output to the user and provides for job control on the user's or system administrator's request.

Job Limits

Compute nodes are used exclusively by jobs of a single user; no node sharing between jobs is done. The smallest allocation unit is 32 nodes (128 processors). Users will be charged for the number of compute nodes multiplied with the wallclock time used. Approximately 400 MB of memory per core are available for applications.